Sec Form 4 Filing - PATTON THOMAS M @ MISONIX INC - 2021-10-29

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person PATTON THOMAS M 2. Issuer Name and Ticker or Trading Symbol MISONIX INC [ MSON] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O MISONIX, INC., 1938 NEW HIGHWAY 3. Date of Earliest Transaction (MM/DD/YY) 10/29/2021 (Street) FARMINGDALE, NY11735 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 10/29/2021 D 104,500( 1 )( 2 )( 3 ) D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other PATTON THOMAS M C/O MISONIX, INC. 1938 NEW HIGHWAY FARMINGDALE, NY11735 X Signatures /s/ Thomas M. Patton 12/08/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Disposed of pursuant to the Agreement and Plan of Merger dated as of July 29, 2021 (the "Merger Agreement") among the Issuer, Bioventus Inc. ("Bioventus"), Oyster Merger Sub I, Inc., a Delaware corporation, and a wholly owned subsidiary of Bioventus ("Merger Sub I"), Oyster Merger Sub II, LLC, a Delaware limited liability company, and a wholly owned subsidiary of Bioventus ("Merger Sub II"), under which (a) Merger Sub I merged with and into the Issuer, with the Issuer surviving as a wholly-owned subsidiary of Bioventus (the "First Merger") and (b) immediately following the consummation of the First Merger, the Issuer merged with and into Merger Sub II, with Merger Sub II surviving as Misonix, LLC (the "Second Merger" and together with the First Merger, the "Mergers"). ( 2 )Pursuant to the Merger Agreement, at the effective time of the First Merger, each share of Issuer common stock was converted into the right to receive a per share amount (the "Merger Consideration") equal to either an amount in cash equal to $28.00 or 1.6839 validly issued, fully paid and non-assessable shares of Class A common stock of Bioventus, $0.001 par value per share ("Bioventus Shares"). The disposition was exempt from Section 16(b) of the Securities Exchange Act of 1934, as amended, pursuant to Rule 16b-3 promulgated thereunder. ( 3 )Includes 97,500 options to purchase the Issuer's common stock which, pursuant to the Merger Agreement, at the effective time of the First Merger, automatically vested and thereafter were cancelled and converted into a right to purchase Bioventus Shares on the same terms and conditions that applied to the options immediately prior to the First Effective Time, adjusted by the Option Exchange Ratio (as defined in the Merger Agreement).

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